ja' De'vID:
future", I take it that the idea is that {vIb} more generally means to move through any medium in the forward direction, but that it's so often [...] forward in time.
I'm definitely with you on this. Okrand very often answers questions like, saying "to express X you can use the verb Y". The obvious {poHDaq leng} was immmeditely skipped, because one does not "travel" through time. Using a verb that includes some kind of transmission through material is a interesting idea, and as De'vID said, Klingons use that word for time travel.
{bIQDaq vIb 'otlhmey; cha' 'ujmey lID} "the photons propagated through two ujes of water".
That's my next question: why not {bIQ luvIb 'otlhmey}? -- Lieven L. Litaer aka the "Klingon Teacher from Germany" http://www.klingonisch.de http://www.klingonwiki.net/Word/VIb